Which of the following is an incorrect statement for periodic abstinence?
The couple should abstain from coitus from day $10$ to $17$ of the menstrual cycle when ovulation could be expected
$10^{th}$ to $17^{th}$ day of the cycle is fertile period, when the chances of fertilisation are high
This prevents the chances of union of male and female gametes
In this method, the ovum and sperms are prevented from physically meeting with the help of barriers
What is correct for pills ?
Which of the following is incorrectly matched?
The mechanical measure of population control includes
Identify given figure.
Find out the correct statement
$I$. Pills prevent ovulation during use as contraception technique
$II$. Copper$-T$ prevents implantation
$III$. Vasectomy produces semen containing no sperm